Abstract: The primary duty of a corrosion resin is to provide the required performance characteristics for its intended environment but often another critical requirement is to provide aesthetic characteristics, which are sometimes a problem to achieve with high molecular weight resin of a crystalline nature. Reduced molecular weight resins will provide improved glass wetting and aesthetics, but these reduced molecular weight polymers may not have the same corrosion performance as their higher weight counterparts. In this study, A 2∶1 (2 moles of maleic∶1 mole of terephthalic∶3 moles of propylene glycol) terephthalic based polymer and a 2∶1 (2 moles of maleic∶1 mole of isophthalic∶3 moles of propylene glycol) isophthalic based polymer with Mw values incrementally increasing from 6000 to 20,000 to determine what is the minimum Mw value required to provide satisfactory corrosion performance in gasohol blends will be compared. Physical property performance retention data will be presented for the various Mw values of the two polymer types. The conclusion analyzed by the physical property retention performance is terephthalic based polymers has a better anticorrosion property than isophthalic based polymers in gasoline alcohol blend.

Key words: terephthalic polymer, isophthalic polymer, underground gasoline storage tank, gasoline alcohol blends, FRP, molecular weight, anti-corrosion resin